#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    int sintyou[3]={0};
    int taijyuu[3]={0};
    char name[4]={'A','B','C'};
    for(int i=0;i<3;i++)
    {
        scanf("%d %d",&sintyou[i],&taijyuu[i]);
    }
    for(int i=0;i<2;i++)
    {
        for(int j=i+1;j<3;j++)
        {
            if(sintyou[i]<sintyou[j])
            {
                char chr=name[i];
                name[i]=name[j];
                name[j]=chr;
                int val = sintyou[i];
                sintyou[i]=sintyou[j];
                sintyou[j]=val;
                int valu = taijyuu[i];
                taijyuu[i]=taijyuu[j];
                taijyuu[j]=valu;
            }
            else if(sintyou[i]==sintyou[j])
            {
                if(taijyuu[i]>taijyuu[j])
                {
                    char chr=name[i];
                    name[i]=name[j];
                    name[j]=chr;
                    int val = sintyou[i];
                    sintyou[i]=sintyou[j];
                    sintyou[j]=val;
                    int valu = taijyuu[i];
                    taijyuu[i]=taijyuu[j];
                    taijyuu[j]=valu;
                }
            }
        }
    }
    for(int i=0;i<3;i++)
    {
        printf("%c\n",name[i]);
    }
}